email subject junk characters for other than english

Hi All.

i have a script-invoice related and when ever it is issued for print output it's converted to pdf and is sent as email to respective users.

for any other language except english the subject line has junk characters(translation doesnt happen).

is there any setting to be done globally for language translation when sending email? i tried all the means but wondering if there could be any setting globally? kindly advise.